This particular jacket would've been worn by a member of the Royal Navy's Commando personnel

The design of US BDU jackets is pretty handy

Beautiful vintage from the thick of WW2

so the usual adjustability is nonexistent

Austrian Army Anzug 75 Flight Jacket Olive Drab - Small 88-92 I/II Pilot This particular jacket would've beenAt a glance Thick Cotton & Polyester Blend Material Zipper Closure 2 Zipper Waist Pockets & Zipper Sleeve Pocket Velcro Patches Scarce Thermal Cold Weather Built In Lining Elasticated Cuffs & Waistband Classic Austrian Army Olive Drab Colour Chest Size: 46" Suggested Size: Medium Slim Label states chest from 88 92cm Sleeve Length: 24" Short Austrian I II Collar to Hem: 28. 5" Modern Militaria Dated 2008 Genuine Austrian Armed Forces Bundesheer Surplus